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Summary: Protected Ctors | Methods | Protected Methods | Inherited Methods

# AbstractInterruptibleChannel

`public abstract class AbstractInterruptibleChannel`
`extends Object` `implements Channel, InterruptibleChannel`

java.lang.Object
↳ | java.nio.channels.spi.AbstractInterruptibleChannel

Known direct subclasses FileChannel, SelectableChannel
FileChannel | A channel for reading, writing, mapping, and manipulating a file.
SelectableChannel | A channel that can be multiplexed via a `Selector`.

Known indirect subclasses AbstractSelectableChannel, DatagramChannel, Pipe.SinkChannel, Pipe.SourceChannel, ServerSocketChannel, SocketChannel
AbstractSelectableChannel | Base implementation class for selectable channels.
DatagramChannel | A selectable channel for datagram-oriented sockets.
Pipe.SinkChannel | A channel representing the writable end of a `Pipe`.
Pipe.SourceChannel | A channel representing the readable end of a `Pipe`.
ServerSocketChannel | A selectable channel for stream-oriented listening sockets.
SocketChannel | A selectable channel for stream-oriented connecting sockets.

Base implementation class for interruptible channels.

This class encapsulates the low-level machinery required to implement the asynchronous closing and interruption of channels. A concrete channel class must invoke the `begin` and `end` methods before and after, respectively, invoking an I/O operation that might block indefinitely. In order to ensure that the `end` method is always invoked, these methods should be used within a `try` ... `finally` block:

>      boolean completed = false;
>      try {
>          begin();
>          completed = ...;    // Perform blocking I/O operation
>          return ...;         // Return result
>      } finally {
>          end(completed);
>      }

The `completed` argument to the `end` method tells whether or not the I/O operation actually completed, that is, whether it had any effect that would be visible to the invoker. In the case of an operation that reads bytes, for example, this argument should be `true` if, and only if, some bytes were actually transferred into the invoker's target buffer.

A concrete channel class must also implement the `implCloseChannel` method in such a way that if it is invoked while another thread is blocked in a native I/O operation upon the channel then that operation will immediately return, either by throwing an exception or by returning normally. If a thread is interrupted or the channel upon which it is blocked is asynchronously closed then the channel's `end` method will throw the appropriate exception.

This class performs the synchronization required to implement the `Channel` specification. Implementations of the `implCloseChannel` method need not synchronize against other threads that might be attempting to close the channel.

## Summary

### Protected constructors
`AbstractInterruptibleChannel()` Initializes a new instance of this class.

### Public methods
`final void` | `close()` Closes this channel.
`final boolean` | `isOpen()` Tells whether or not this channel is open.

### Protected methods
`final void` | `begin()` Marks the beginning of an I/O operation that might block indefinitely.
`final void` | `end(boolean completed)` Marks the end of an I/O operation that might block indefinitely.
`abstract void` | `implCloseChannel()` Closes this channel.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `java.nio.channels.Channel`
`abstract void` | `close()` Closes this channel.
`abstract boolean` | `isOpen()` Tells whether or not this channel is open.
From interface `java.nio.channels.InterruptibleChannel`
`abstract void` | `close()` Closes this channel.
From interface `java.io.Closeable`
`abstract void` | `close()` Closes this stream and releases any system resources associated with it.
From interface `java.lang.AutoCloseable`
`abstract void` | `close()` Closes this resource, relinquishing any underlying resources.

## Protected constructors

### AbstractInterruptibleChannel

    protected AbstractInterruptibleChannel ()

Initializes a new instance of this class.

## Public methods

### close

    public final void close ()

Closes this channel.

If the channel has already been closed then this method returns immediately. Otherwise it marks the channel as closed and then invokes the `implCloseChannel` method in order to complete the close operation.

Throws
`IOException` | If an I/O error occurs

### isOpen

    public final boolean isOpen ()

Tells whether or not this channel is open.

Returns
`boolean` | `true` if, and only if, this channel is open

## Protected methods

### begin

    protected final void begin ()

Marks the beginning of an I/O operation that might block indefinitely.

This method should be invoked in tandem with the `end` method, using a `try` ... `finally` block as shown above, in order to implement asynchronous closing and interruption for this channel.

### end

    protected final void end (boolean completed)

Marks the end of an I/O operation that might block indefinitely.

This method should be invoked in tandem with the `begin` method, using a `try` ... `finally` block as shown above, in order to implement asynchronous closing and interruption for this channel.

Parameters
`completed` | `boolean`: `true` if, and only if, the I/O operation completed successfully, that is, had some effect that would be visible to the operation's invoker

Throws
`AsynchronousCloseException` | If the channel was asynchronously closed
`ClosedByInterruptException` | If the thread blocked in the I/O operation was interrupted

### implCloseChannel

    protected abstract void implCloseChannel ()

Closes this channel.

This method is invoked by the `close` method in order to perform the actual work of closing the channel. This method is only invoked if the channel has not yet been closed, and it is never invoked more than once.

An implementation of this method must arrange for any other thread that is blocked in an I/O operation upon this channel to return immediately, either by throwing an exception or by returning normally.

Throws
`IOException` | If an I/O error occurs while closing the channel

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